Kratom can have other risks, these are generally through acting irresponsibly whilst on the drug.
Under no circumstances should you drive on kratom or operate heavy machinery. Even if you feel stimulated the more sedative effects could come about without warning.
The greatest risk with kratom is falling asleep, which is innocent enough in itself but if you are driving or partaking in a dangerous activity then this could end very badly. Do not put yourself in any situation where you might cause harm to yourself or others.